A N-path filter includes a plurality of switch-capacitor circuits controlled by a plurality of logical signals, respectively, and joined at a common shunt node, each of said switch-capacitor circuit comprising: a respective switch configured to controllably connect the common shunt node to a respective middle node in accordance with a respective logical signals among said plurality of logical signals; and a respective balanced MOS (metal oxide semiconductor) capacitor connected to the respective middle node, wherein the respective balanced MOS capacitor exhibits a capacitance at the respective middle node with reference to a power supply node and a ground node.

A wide band radio frequency (RF) circulator is presented. The RF circulator includes at least one stage having four ports, a first end, and a second end, wherein a first port and a third port are connected at the first end of the at least one stage, wherein a second port and a fourth port are connected at the second end of the at least one stage, wherein each of the at least one stage includes a pair of couplers connected through a first delay line and a second delay line, thereby forming a network of couplers in the at least one stage.

The disclosure concerns a signal aggregator component designed to couple with an antenna element to form an antenna system, wherein the resulting antenna system can achieve one-hundred percent or greater efficiency in receiving mode. In addition, the antenna system can achieve specific polarization and gain in different sectors of the antenna radiation pattern. The signal aggregator functions to dynamically enable or disable any number of its RF ports to select the RF input signal to aggregate.

According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

The branch portion includes: a first circuit portion electrically connected to the main wire while extending to a leading end from a base end of the branch portion; a second circuit portion electrically connected to the main wire while extending to the leading end from the base end of the branch portion and electrically connected to the first circuit portion at the leading end of the branch portion; and a ground conductor that is disposed between the first circuit portion and the second circuit portion while extending to the leading end from the base end of the branch portion and has one end to be grounded and the other end to be opened.

A noise filter and an electronic device including the same are disclosed. The noise filter is configured to suppress noise generated in a power line or a ground line of a power circuit unit provided in an electronic device. The electronic device including: at least one coil connected to the power line and the ground line; and a core around which the coil is wound, a common core portion configured to suppress common mode noise generated at the ground line and a normal core portion configured to suppress normal mode noise generated at the power line are formed as a single body. Thus, the common mode noise filter and the normal mode noise filter are integrated with each other to thereby improve productivity and reduce production costs.

An electronic pen includes a signal generator, a power supply, and a resonance circuit. The signal generator is configured to generate a signal. The power supply is configured to supply power to the signal generator. The resonance circuit is configured to generate a current based on the signal and emit a magnetic field based on the current.

Input/output terminals 6a, 6b and 6c are formed within portions of cutouts 5a, 5b and 5c provided in a ground conductor 5 on the underside of a magnetic material 3; signal conductors 9a, 9b and 9c are formed within portions of cutouts 8a, 8b and 8c provided in a ground conductor 8 on the top surface of a dielectric substrate 7 at the same places as the cutouts 5a, 5b and 5c of the ground conductor; through holes 10a, 10b and 10c electrically connect a center conductor 4 to the input/output terminals 6a, 6b and 6c; metal bumps 11a, 11b and 11c electrically connect the input/output terminals 6a, 6b and 6c to the signal conductors 9a, 9b and 9c facing each other; and metal bumps 16 electrically connect the ground conductor 5 to the ground conductor 8.

Systems and methods for suppressing electrical noise in an electrocardiogram (ECG) signal obtained by at least one electrode and displayed on an ECG monitor are disclosed. The system includes a conductive material distinct from the at least one electrode and configured to contact a surface of a patient, and filtering circuitry connected in series between the conductive material and ground. The filtering circuitry may be configured to filter to ground the electrical noise present within the patient before it is received by the at least one electrode and is prevented from distorting the ECG signal that is displayed on the ECG monitor.